A colourless gas is dissolved in water and the resulting solution turns red litmus blue ; the ga...

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A colourless gas is dissolved in water and the resulting solution turns red litmus blue ; the gas may have been which one of the following?
(a) \( \mathrm{HCl} \)
(b) \( \mathrm{H}_{2} \mathrm{~S} \)
(c) \( \mathrm{SO}_{2} \)
(d) \( \mathrm{NH}_{3} \)
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